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    Howto recover wrong fuses settings on a AVR atmega8

    hi experts
    How to recover wrong fuses settings on a AVR say atmega8 ? may be isp disabled (cannot detect chip error-24).don't suggest HV programmer method pls suggest any easier way to recover .
    i am using pony prog2000.thanks.
    Last edited by santoshaxl; 1st October 2010 at 11:28.

    •   Alt1st October 2010, 11:14

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    Re: Howto recover wrong fuses settings on a AVR atmega8

    STK500 development board can recover avr (in parallel high voltage programming mode)

    or
    Check this link

    Atmega HVPP fusebit doctor – napraw fusebity, fix fusebits >> Manekinen DIY



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    Re: Howto recover wrong fuses settings on a AVR atmega8

    can i connect to external clock source(1mhz) for recovery of atmega8 using pony prog ?



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    Re: Howto recover wrong fuses settings on a AVR atmega8

    It depends on how the fuses are set.

    If you had selected external crystal then this may work.

    If you had disabled the spi then you need a parallel high voltage programmer

    Nandhu



    •   Alt1st October 2010, 18:35

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    Re: Howto recover wrong fuses settings on a AVR atmega8

    thanks for reply sir i think the chip is spi disabled and as you suggested i found this circuit for hvp for atmega series ,i have little confusion how to set internal crystal value from 3 -8 mhz .pls provide me screen shot for setting this option .


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    Re: Howto recover wrong fuses settings on a AVR atmega8

    The circuit is a good one and restore the fuses to the default values (factory settings).

    Avoid using pony prog. Better use usbasp.

    For settings use fuse bit calculator software

    Nandhu


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    Re: Howto recover wrong fuses settings on a AVR atmega8

    hi, check the post 4 of this thread by ctownsend Erasing the Programming of Locked Atmega .... it actually works i recovered 2 atmega8. use pony prog.


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    Re: Howto recover wrong fuses settings on a AVR atmega8

    For recovering fuse bits, there are various techniques discussed in this thread.
    Erasing the Programming of Locked Atmega ...
    Find the way you find easy and working. By the way, using USBasp with ProISP as programming software works great.


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    Re: Howto recover wrong fuses settings on a AVR atmega8

    thanks to all now i am gonna construct usbasp( pranam77/nandhu015)

    as suggestion because easy to construct before that i'll try like welove8051 suggested using external clock source .lastly pls how to select 4mhz crystal internally is it check on cksel 1100 along with bootsz1 and bootsz0 checked



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